Belt-driven conical-pulley transmission

Abstract

A transmission with a drive side and an output side conical disk pair. One conical disk pair includes a fixed disk carried by a shaft, a movable disk non-rotatably connected with and axially movable relative to the shaft, and a support ring axially attached to the shaft adjacent a back side of the movable disk. A pressure chamber between the support ring and the back side of the movable disk is supplied with hydraulic pressure medium through a passage in the shaft that opens to the surface of the shaft. An end region of the movable disk when moved along the shaft passes over the opening at a maximum spacing of the movable disk from the fixed disk, and a hydraulic medium connection exists between the passage and the pressure chamber through drainage slots between an inner surface of the movable disk and the peripheral surface of the shaft.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This is a continuation of International Application Serial No. PCT / DE2003 / 002373, with an international filing date of Jul. 15, 2003, and designating the United States, the entire contents of which is hereby incorporated by reference to the same extent as if fully rewritten.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention concerns a belt-driven conical-pulley transmission with a drive side and an output side conical disk pair.[0004]2. Description of the Related Art[0005]Belt-driven conical-pulley transmissions are recently increasingly being used in passenger cars. They not only make an increase in comfort possible, but also a decrease in fuel consumption. In order to expand the spectrum of use of belt-driven conical-pulley transmissions, intensive development efforts have been undertaken recently with respect to their capacity to transmit torque.[0006]FIG. 5 depicts the upper half of a half section through an ...

AI Technical Summary

Benefits of technology

The invention is a refinement of a belt-driven conical-pulley transmission with a drive side and an output side conical disk pair. It includes a pressure chamber that is axially between the support ring and the back side of the movable disk, which is supplied with hydraulic pressure through a passage in the shaft. The pressure chamber is designed to operate trouble-free even at very high torques transmitted from the fixed disk, while also ensuring oil supply to the conical disk with low temperatures. The movable disk is non-rotatably connected and axially displaceable with the shaft, and a support ring is attached axially fixed on the shaft with a spacing from the back side of the movable disk. The support ring has at least one pressure chamber connected to it, which is supplied with hydraulic pressure through a passage in the shaft. The pressure chamber is designed to ensure that the oil supply is not affected by tilting torques, which are applied to the movable disk as a result of forces acting from an endless torque-transmitting means of the belt-driven conical-pulley transmission. The conical disk pair is designed with an incline between the outer surface of the shaft and the end of the movable disk facing the support ring, which promotes drainage slots and facilitates the supply of pressure medium. The movable disk is also designed with a collar and a circular recess to mitigate the strength-side critical position and reduce the cost of reprocessing the conical disk.

Problems solved by technology

In practice this means comparatively high leakage losses, especially if the pressure in pressure chamber 22 is high.

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